Electric storage battery.



S. H. MORTIMEIR & V. R. BOTTONE.

ELECTRIC STORAGE BATTERY.

APPLICATION man MAR.11.1914.

.1 ,201,074. Patented Oct. 10, 1916.

.' 2 SHEETS-SHEET 2.

l I I 1 WITN E-SSES:

WAM/TW.; l M @JW INVENTORS.'

PENNSYLVANIA.

nLno'rRIc STORAGE BATTERY.

Specification of Letters Patent.

Patented Oct. 10, 1916.

Application filed March 11, 1914. Serial No. 824,043.

To all Hwm. 'it muy concern.:

Be it known that wc, Sfroon'roN Harn Mou'rmna. a citizen of the United States, and Vieron Roms Bo'rroxn` a citizen of England, both residents of Philadelphia, in the county of Philadelphia and State of Pennsylvania. have invented a. certain new and useful Improvement in Electric Storage Batteries, whereof the following is a specielectrolyte. Ilowever, as `gas is formed byelectrolytic action within such casings, the latter must be provided with means to permit the escape of Such gas.

'l`hercfore, it is an object of our invention to provide such a storage battery with a casing having a vent device permitting the escape of gas without permitting the escape of the liquid eleetrolvte, regardless of the inversion of said casing.

As hereinafter described, oml invention includes an electric storage battery having an invertible casing containing a plate compartment in its lower portion and ay gas compartment in its upper portion; plates in said plate compartment having terminals eX- tending exterior to said casing; a' liquid electrolyte in said plate compartment, but in communication with said gascompartment; and a vent device including an outer open- ,iing in the wall of said casing, and a plurality of conduit members, extending one within the other, forming a tortuous passageway in communication,with said vent opening, and opening at its inner end into said gas compartment; so constructed and arranged with reference to the quantity of said electrolyte that the lat-ter is normally prevented from reaching the'open outer end of said vent conduit, through Which-the gas escapes.

In the most complex forln of our invention hereinafter described, said conduit members are perforated cylindrical tubes extending transversely in the battery casing in relatively eccentric relation and with the innermost tube Acommunicating with the vent opening through the top wall of said casing; such communication being by way of a vertical tube extending from said inne-r tube through said other tubes, transversely to the axes thereof.

Our invention includes the various novel features of constructionv and arrangement hereinafter more definitely specified.

In the drawings, Figure I is a front elevation of a storage battery conveniently embodying our invention. Fig. II is a central vertical sectional view of said battery, taken on the line II, II, in Fig. I. Figs. III, IV, V and VI are-fragmentary sectional views, similar to Fig. II, but showing modied forms of our invention. Fig. VII is a front elevation of a battery embodying a modified form of our invention, being the most complex` form thereof above contemplated. Fig. VIII is a central vertical sectional view of said battery, taken on the line VIII. VIII in Fig. VII. Fig. IX is a fragmentary vertical sectional View, similar to Fig. VIII but showing a simplified form of our invention. Fig. X is a fragmentary front elevation of a battery embodying a 'modified form of our invention.

The storage battery shown in Figs. I and II includes the invertible rectangular casing 1 containing the plate compartment 2 in its lower portion and the gas compartment 3 in its upper portion. The partition 4L which is in rigid relation with said easing 1, between said two compartments, permits Huid communication between them. The plates 5 and G in said plate compartment 2 are held by said partition 4 upon the supporting ribs 8, at the bottom of said casing, which permit the flow of liquid acid electrolyte 9 beneath said plates, which are held in separated relation by the porous separators 11 which are preferably formed of wood deprived of such of its constituents as might interfere with the electrolytie action or efficiency of the battery. Said electrolyte 9 extends above said partition 4 and in communication With said gas compartment 3. Said plates are held in assembled relation as shown, by their respective terminals 13 and 14 which extend exterior to said casing 1 through the respective openings 15 and 16 in the lid 17 of said casing. Said lid 17 has the central opening 18, through which the electrolyte 9 may be introduced and removed; said opening being normally closed by the plug 20 having the loo head 21 which may be sealed exterior to said lid. Said lid 17 is primarily separate from lsaid casing l", but is cementedin 'integral latter; the inner end of said tube'24 terininatl ing in spaced relation with a wall on said casing apposed to said wall having said vent opening. The intermediate tube 26 surrounds Saidinner tube 24, in concentric relation therewith, and isrigidly connected at its opposite ends to said apposed walls; said intermediate tube having perforations 27 at the top and bottom thereof, in vertical aiiiiement, intermediate of its length, as shown in Fig. `II. The outer tube 29 which Surrounds said inner and intermediate tubes, iii-eccentric relation therewith as shown in" Fig. I,

' and is rigidly connected at its opposite ends `to said apposed Walls; has perforations 31 at iso opposite sides thereof, in horizontal aline ment, adjoining said wall having said vent opening 23, and nerforations 32 at the' top and bottom thereoiih vertical alinement, ad-4 joining said apposed wall.

It may be observed that the perforated cylindrical tubes 24, 26' and 29 above described form a conduit for the escape of the tiges from said gas compartment 3 to the outer Fatmosphere, such conduit beginningwith the perforations insaid outer tube 29 and ending with the vent opening 23. Said inn'er tube y24 is of such length, with reference to they quantity of the electrolyte 9, that the latten could not reach the open inner end Vof said tube 24 -even if the other surrounding tubes, 26 and 29y were omitted. Consequently, said liquid 9 can only be caused to enter the inner I end4 of said tube 24 by splashing.

Therefore, we may include splash preventing material 34 inrand between said tubes, although Said casing 1 is impermeable to the liquid 9 under normal conditions of use or misuse even when such material is omitted." Said material 34 may be porous. y

. Although we prefer to `form the gas vent device above describedof 'tubulancoiiduil members extending one within' the other and in the eccentric relation described, because such construction and arrangement has beeny found more efficient for the purpose contemplated than the other forms hereinafter described, it is to be understood that our inventioniniay be embodied lin other forms. For instance, as shown in Figf III, the vent conduit may lconsist solely of thei'nner tube 24; the other surrounding tubesbeiiig omitted, as ali'ove contemplated; said tube. being filled` with porous material 34 or not. Howperforations 37, and such inclosure may be aA cone or a pyramid. with a quadrangular base.

As shown in Fig. V, the inner tube 24 is surrounded by the' intermediate inclosure 38 having the perforations 39, and the outer inclosuref 40 having the perforatioiis 41; 'said inclosures being cylindrical with hemispl'iericalends. As shown in Fig. VIN the inner tube 24 maygbesdurrounded by twoconcentric spherical inclosures; the intermediate iiiclo sure 43 having the perforations 45, and the outer inclosure '46 having the perforations 47."`

The storage battery shown in Figs'f VII and VIII includes the invcrtible rectangular casing 51 containing the plate comparis-4A ment 52 in its lwer portion and the gas compartment 53 in itsupper porti0n.. The parti- 'tion 54 which is in rigid relation with .said

casing 51, betweensaid two cemp'artments,

. permits fluid'coni-munication between them. `The plates 55 and 56 in 'said plateycoinpartnient 52`areiheld by said partition 54 upon the supportingfribs 58, at the bottom ot casing, which permit the' flow. .of liquid fsaid casing. Said lid' 67 is primarily sepa- A' .i

rate from said casing 51 but is cemented in integra-l relation therewith, so' as to form the top wall thereof, as shown in Figs. VII

and VIII: vSaid casing 5 1 has the opening y 68 through which the electrolyte `69 may be' introduced and removed;v said opening gbeing normally closed bythelplug-TO having the head 7^1fwhich may be sealed exterior to` said casing'. Said casing 51 .has the vent device includ-ing the outer IVentppening 73 in said top wall or lid 67 of the casing;

which opening is in communication with the vinner tube 74` by Way ofthe vertical tubev75. 'Both ends of said .inner tube 74 terminate in such spaced relation with the adjacent I. walls of the casing 51 that the electrolyte 1.00 i acid electrolyte 59 beneath said plates, which L.

tube 7G surrounds said inner tube -L, in concentric relation therewith, and is rigidly connected at its opposite ends to the 'alls of said easing; said intermediate tube having perforations 7T at the top and bottom thereof, intermediate ot' its'length. as shown in Fig. VIH. The outer tube Tt) which surrounds said inner and intermediate tubes, in eccentric relation therewith, like the tube 29 above described, or in concentric relation therewith as shown, and is rigidly connected at its opposite ends to said easingwalls, has -perforations Si at opposite sides thereof, in horizontal alinenient, adjoining one ol said'walls, and per torations' at the top and bottom thereof, in vertical alinement, adjoining said other wall. Said tubes Tsi, 75, 7G and 7T form a conduit for the escape of gas from said gas compartment :33 to the outer atmosphere, such con? itinning with the perforations in said outer tube TT and ending with the vent opening 73. We prefer to .include porous, splash preventing material 84, in and between said tubes, although said casing 51 is impervious to the liquid 50 under normal conditions of use or misuse even when said porous material 84 is omitted.

Although in the forms of our invention above described, we have shown the inner tube of the vent device extending; transversety with respect 'to the battery casings, it is to be understood that it may be other wisedisposed. For instance, shown in Fig. 1X, the inner tube 8G ext-ends vertically, in alinement with the tube 87 by which it is connected in communication with the outer vent opening 88 in the lid or top wall 80 of the casing 00, which is otherwise ,like the casing 51 above described. Said inner tube SG is inclosed by the tube which extends transversely in said casintr 00 in rigid relation with the opposite vertical walls thereof and has perforations QQ vand 0i respectively adjoining said walls.

FItiinay be observed that said inclosing;V tube QZnmy be omitted, provided that the open end ot' said inner tube SG is in such spaced relation with the walls ot' said casing- 00 that the liquid velectrolyte Slo cannot be tilted into it.

ln Fig. X we have shown a modified form of our. invention, whiehis similar to Fig'. VH1. except that the conduit tubes which extend one within the other are dis- "posed with their axes parallel with the plane of the plates instead ot transverselv with respect thereto as in Fig". VIH. In

this form of our invention, the outer veutv o l'iening- 0S in the lid or top wall 00 oi the casi-ng 100 is in communication with the .inner 'tube 102 by way oi. the vertical. tube tions li00respectivelyjat the top and bottoni alinement at the other end.

thereof. Said inner tube 102 and intermediate tube 105 are surrounded by the outer inclosure 108 having,` a pair ot' perforations lofi. in horizontal alinement, at one end, and a pair ot' perforations 110 in vertical It is to be understood that the tortuous passageway formed by the tubes of said vent device,

` may be iilled with porous, splash preventing material.

It may be observed that the t'orm of our invention shown in Fig. X is the most coinplex iorm thereof which we have chosen Al'or illustration but is advantageous in that the entire vent device is carried by the lid El!) and may be assembled in connection therewith before s ail lid is cemented in connection with the casing 100.

lt is to be noted that thel essential feature of our invention. which is embodied in each of the dili'erent forms thereof above described. is a conduit o )enine` at its inner end and arrangement herein set iorth, as it is obvious that various niodiiications may be made therein without departing' from the essential features of our invention as defined in the appended claims.

1. An electric storage battery including an invertibh` rectangular casing containing,-

a plate compartment in its lower portion and a gas compartment in its upper portion; a partition between said compartments permitting iiuid connnunication between them; plates in said plate. compartment held in operative position by said partition and having` terminals extending?r exterior to said casing; a liquid acid electrolyte. in said cas-k ing, covering?r said plates` extending' above said partition, and in communimition with .said gras compartment; the quantity of said electrolyte being; so limited that it cannot trap gas at the. vent, in any position to which said casingmay be turned; a vent device including.;` an opening in one ot the verti fal walls of said casing" extending parallel with said plates, an inner tube in communitattion with said opening extending horiv'ontally in .said gas comlmrtment, transversely with respect to the planes ot' said plates, and above the latter; the inner end of said tube terminating in spaced relation with a Wall of aid casing apposed to the wall having said v bottom thereof, in lvertimtl alin 20 ing may escape through the tortuous 'cape of the electr pertinent in its l 40 ing, an inner" tube in com] 'ner and intermediate tube 55 horizontalV aline Leonora opening,j an intermediate. tube, surrounding trolyte,l regardless of the inversion of said said inner tube, in concentric relation casingif", i therewith, rigidlyv `connected at its .oppo- 3. Anielectric storage batteryincluding site ends to said apposed' Walls; saidv an invertib'le casing containing a', plate 5 intermediate tube having perforations at. compartment in its lower portion and a gas v7() the top and bottom thereof, in vertical compartment in its upper portion; plates" f "alinement, intermediate of its length en said plate compartment having termina -s-'f 'outer tube, surrounding saidinnen and ini" i.extending exterior to said casing; a liquido,

in eccentric relation theretermediate tubes,

d at itsvopposite ends 10 with, rigidly connecte to said apposed Walla-having perforations at opposite sides thereof, in horizontal aline; ment, adjoining said wall having said vent i opening, and perforations at the topA and ement, adpposed Wall; 4and porous,- splash preventing, material in and between said tubes; whereby gas arising `in said gas chamber from electrolytic action in'said cas` passageway beginning with the perfo/rations in said outer tube and terminating with ysaid vent opening to the atmosphere` from., said inner tube, but without permitting the esol'yte,v regardless of the inversion kof said casing. f

2. Anele'ctrictstorage battery includingI an invertible casing 'containing a plate com'L oWer portion :ind-y a gas' compartment in its upper portion; plates 'in'4 said plate compartment having terminals extending exterior to said casingg-a liquid electrolyte in said casing, covering said`* plates,in communication With-said gas compartimentfthe .quantity of said electrolyte being solimited that'it cannot trap gas at the vent, in any position to which` said eas- 4 ingmay be turned, aV vent device including g an opening in a vertical Wall of said Icas'- nunication with said opening extending horizontally in said 'gas compartment, above said platcsnthc inner end of said tube terminating in .spaced relation `with `a Wallof said casing; an intermediate tube, surrounding said `inner tube, rigidly connected atits opposite ends to said casing wallsgfsaid intermediate tube having perfor-ations at theigztop and bottom thereof,

in vertical alinement, inteijfmediate 4of its length;l an outer tube, surrounding said ins, iii eccentric relation thereivithVrigidly connected at its opposite ends to said casing Walls having perforations alta opposite sides thereof, vin ment, adjoining said Wall having said .vent opening, and pe'rforations at the top and bottom thereof, in vertical alinement, adjoining' the. `apposed Wall; whereby gas arising in rsaid gas chamber. frpm electrolytic actionin said casinglmay escape through the tortuous passageway beginning with the perforationsin said outer tube and terminating with said vent opening to the atmosphere from said inner tube, but without permitting the escape of the elecjoining said. a

, gas arising in 'said gas chamber from aidl casing ymay, escapep',"

electrolyte in Said casing, in communication`r "With said gas compartment; the quantity ofjl .said electrolyte"being so limited thatlt c'aiifI not trap 'gas `at the .vent-,in any'position-to which said Icasingmay be turned; a/ ve device includingan openingv in a vertice Wall of said casing; an inner tlibeI lincomzmunication-With said openingand extend ing horizontally in saidy gas' c(impartruent,i.j above said plates; the inner end. of said tubeI communicating xvith said gascompartment;1l 1,. an'interme'diate tube, surrounding Said 'lne 3'5'1v ner tube, rigidly connected. to .said casing; said intermediate tube having perforations at thetop and bottom thereof, in vertical alinement, `intermediate 'of its lengthfanyf outertube, surrounding said inner and 90 tgei'niediate tubes,'in eccentric relationtherewith, and. rigidly `eonnected'to said casing,4 Ihavimg perforations at oppositesides thereo in horizontal alinement,at one end, and perf, forat'ions at the top and bottom thereof, in 95 vertical aline'ment, at its otherend; Wh

ereby elec- 'trolytic action in s through 4the tortuous with the perforations 1 terminating with said vent atmosphere from said inner out permitting the escape of electrolyte, rel gardless of the inversion of said easing.

4. l,An electr-ip storage. battery' including an invertible casingcont'aining aplate compartment in its lower portion and 'a gas vcompartment in its'u'pper portion; plates in said plate compartment having 'terminals extending exteriorto 'said casing; a liquid. electrolytel in said casing, in communication with'said gas compartment; the quantity of said electrolytebeing so limited that itcannot trap. gas at the vent', in any position to which said casing may be tu-rned; al vent device inclufding an opening in a Wall of said casing; an inner tube in communication withV said opening:r extending insaid gas compartment, in communication there-v' with; anintermediate tube,I surroundinguzo said inner tube, rigidly connected to said casing; said 4intermediate tube having per` -fortions atthe top and bottom thereof, in vertical... alinement, intermediate of vits length: an vouter tube, surrounding said inne'r and intermediate tubes, and rigidlyconnected to said casing, having perforations at opposite sides thereof, in hoi'izoptal alinement, at one end, and porforations at' the' top and bottom thereof, in .veiitical aline' l passageway beginnin n said outer tube an opening to the tube, but withiii/54 said plate compartment having terminals extending'exterior to said casing; a liquid electrolyte in said casing, in communication with said gas compartment; the quantity of said electrolyte being so limited that it cannottrap gas at the vent,l in any position to which said casing may be turned; a vent device including an opening in a wall of said casing; an inner tube in communication with said opening extending in said gas compartment, in communication therewith; another tube, surrounding said inner tube, rigidly connected to said casing; said other tube having perforations at the top and bot-A tom thereof, in vertical alinement, intermediate of its length; whereby gas arising in said gas chamber from electrolytic action in said casing may escape through the tortuouspassageway beginning with the perforations in said outer tube and terminating with said vent opening to the atmosphere from said inner tube, but without permitting the escape of tthe electrolyte, regardless oi the inversion `of said casing.

G. An electric storage battery including an invertible casing containing a plate compartment in its lower portion and a gas compartment in its upper portion; plates in arid plate compartment having terminals extending exterior to said casing; a liquid electrolyte in' said casing, in communication with said gas compartment; the quantitygof said electrolyte being so limited that it'canyfl not trap gas at the vent, in any position to which saidcasing may be turned; a vent device including an opening in a wallof said casing; an inner tube in communication with said opening extending in said gas ,compartmenh in communication therewith; an outer tube, surrounding said inner tube, and rigidly connected to said casing, having perforations at opposite sides thereof, in horizontal alinement, at one end, and perforations at the top and bottom thereof, in vertical lalineinent, at its other end;

whereby gas arising in said chamber from electrolytic action in said casing may escape through the tortuous passageway .beginning with the perfor-ations in said outer tube and terminating with saidvent opening to the atmosphere from said inner tube, but without permitting the escape of the electrolyte, regardless ofthe inversion of said casing.

7. An electric storage battery including an invertible casing containing a plate compartmeiit in its lower portion and a gas compartment in its upper portion; plates in said plate compartment having terminals eX- tending exterior to said casing; a liquidk electrolyte in said casing, in communication with said gas compartment; the quantity of` said electrolyte being so limiftdethat it cannot trap .gas at the vent, in any position to which said casing may be turned; a vent device including an opening in a wall of said casing; an inner tube in communication with said opening extending in said gas compartment, in communication therewith; aniiilclpl sure surrounding said inner tube, andy-rigid4A idly connected to said casing, having perforations at the top and bottom thereof; whereby gas arising in said gas chamber from electrolytie action in said casing may escape through the tortuous passageway beginning with the perforations in said outer tube and.

terminating with said vent opening to the atmosphere from said inner tube, but without permitting the escape of electrolyte, regardless of the inversion of said casing.

` 8. An electric storage battery including an invertible casing containing a plate compartment in its lower portion and a gas compartment in its upper portion; plates in said plate compartment having terminals extending exterior to said casing; a liquid. electrolyte in said casing, in communication with said gas compartment; the quantity 0fsaid electrolyte being so limited that it cannot trap gas at the vent, in any position to which said casing may be turned a vent device including an opening in a wall of said casing; an `inner tube in communication with said opening extending horizontally in said `gas compartment, in communication therewith; the inner end of said tube terminating` in spaced relation with the wall of said casing apposed to the wall having said opening; anA iiiclosurc surrounding said inner tube,

and rigidly connected to said casing having y perforations at the top and bottom thereof; whereby gas arising in said gas chamber` from electrolytic action in said casiiig may escape through the tortuous passageway beginning with a perforation in said inclosure and terminating with said vent opening to the atmosphere from said inner tube, but without permitting the escape ofthe electrolyte` regardless of the inversion of said Casini;

9. Aa electric storage battery including an l1 ertible casing containing a plate compartment in its lower portion and a gas compartment inv itsupper portion; plates in rsaid plate compartment having terminals extending exterior to said casing; a liquid electrolyte in said casing, in communication with said 'gas compartment; the quantity of saidelectrolyte being so limited that it cannot trap gas at the vent,i1i any position to which said casing may be turned; a vent device including an opening in a wall of said casing; an inner Vtube in communication with said opening extending in said gas compartment;

aii inclosure surrounding the innen end of said tube and having aperforation; whereby gas arising in said gaschamber from electrolytic action in said casing mayescape through the tortuous passageway beginning with a perforation in lsaid inclosure and terminating with said vent opening to the atmosphere from said inner tube, but without permitting the escape of the` electrolyte, regardless of the 'inversion of said casing.

10. An electric storage batteryincluding an invertible casing containing a plate coinpartnientI in its lower portion and a gas compartment in its upper portion; plates insaid platecompartment having terminals extending exterior to saidcasing; a vliquid electrolyte in said casing, 'in communication with 25 a plate compartment in its lower portion .and-

a gas compartment in its upper portion; a partition between said compartments permitting fluid communication between them;

plates in said platel compartment held in op erative position by said partition and having terminals extending exterior to said casing; a liquid acid electrolyte in said casing, covering Said plates, extendinglabove said partition, and in communication with said gas compartment; a vent device including an openingin one of the vertical walls ot said' casing extending parallel with said plates, an inner tube in communication with said opening extending horizontally in said -gas compartment, transversely with respect to the planes of said plates, and above the latter; the inner end of said tube terminat-v ing in spaced relation lwith a wall of said casing apposed to the wall having said opening,'an intermediate tube, surrounding said .inner tube, in concentricrelation therewith,

rigidly connected at its opposite ends to sai-d apposed walls; an outer tube, surrounding said inner and intermediate tubes, in eccentric relation therewith, rigidly connected at its opposite ends to said apposed walls; and

' perforations in said intermediate and outer tubes forming a tortuous passageway leading to said vent opening; whereby gas arising in said g'as chamber from electrolytic actionin said casing may escape through the tortuous passageway beginning with the perforatibns in said outer tube and terminating with said vent opening to the atmosphere from said inner tube, but without permitting the escape of the electrolyte, regardless of the inversion of said casing.

12. An electric storage battery including an invertible rectangular casing containing a plate compartment in its lower portion and a gas compartment in its upper portion ;4 a partition between said compartments. pei'- mitting fluid communication between them;i plates in said plate compartment held in operative position by said partition and having terminals extending exterior to said casing;

a liquid acid electrolyte in said casing, cov! ering said plates, extending above said partition, and in communication with said gas '5,compartment; the quantity of said electrolyte being so limited that it cannot trap gas atthe vent, in any position to which said .casing may be turned; a vent device including an opening in one of the vertical'iwalls of said casing extending parallel with said plat'es, an inner tube in communication with said opening extending horizontally7 iii said gas compartment, transversely. `with ,respect 'to the planes. of said plates, efnd'above 'the q latter; the inner end of said tu-be terminating' in spaced relation withja wall ofisaid casing apposed to the wall having saidbpening, an intermediate tube, surrounding said inner tube, in concentric relatiene/thercwitli,v

rigidlv connected at its opposite ends to said apposed walls; an cuter tube, surrounding sai/d innei` and intermediate tubes,- in eccentric relation therewith, rigidly connected at its opposite ends tosaid apposed walls; and perforations in said intermediate and outer tubes forming a tortuous passageway leading to said vent opening; whereby gas arising in saiddgli chamber from electrolytic ac- `tion in sai casinginay escape through the tortuous passageway beginning with the perforations in said 1outer tube and terminating with said vent opening to the atmosphere from said inner tube. but Without permitting the escape of the electrolyte, regardless of the inversion of said casing.

13. An electric storage battery including an invertible casing containing a plate compartment in its lower portion and a gas compartment in its upper portion; plates in said plate compartment having terminals extending exterior to said casing; a liquid electrolyte in said casing,inicommunication with said gas compartment; the quantity of said electrolyte being so limited that it cannot trap gas at the vent, in any position to which said casing may be turned; the 'vent device including an opening in a wall of said eas ing; an inner tube in communication with said opening extending horizontally in said llO gas compartment, in communication therewith; the inner end terminating in spaced relation with the Well of said casing apposed to the Wall lia-ving seid opening; an inclosure surrounding said inner tube, and rigidly Connected to said casing, having perforations upon respectively opposite sides thereof; whereby gas arising in seid gas chamber from electrolytie action in said casing may escape through the tortuous passa-ge- Way beginning with the perforations in said inolosure and terminating With said vent opening to the atmosphere from said inner tube, but Without permitting the escape of the electrolyte regardless ofthe inversion of 15 said casing.

In testimony whereof, We have hereunto' signed our names at Philadelphia, Pennsylf Vania, this fourth day of March, 1914.

STOCKTON HETH 'MORTIMER VICTOR RULES BOTTONE. Witnesses:

ELsm M. BEr'rsoH, ROYAL T. Molins. 

